Amplifier type: AV amp Bluetooth connecting distance: within 10 meter(30 feet) Bluetooth standard: Bluetooth 4.0+EDR Headset power: 105mW*2 Rated power: 30W*2 Voltage input: DC 12-24V Current input: 3-4A AUX Audio Input: 3.5mm audio singal cable Bluetooth connecting: -Power on the amplifier -Using smart phone or notebook with Bluetooth function -Searching "F900 Music play" Bluetooth, click the connecting. If hint PIN pls enter 0000, then you can play wireless mnusic after connecting. Bluetooth indicator condition: Blue light twinkle-means Bluetooth has not been connected. The indicator lights for a long time and then twinkle-means Bluetooth has been connected successfully. Package including: Package includes: 1*bluetooth amplifier 1*audio signal cable 1*AV audio signal cable 1*US-type power supply